Fix IPython inputhook (workaround).

src/prompt_toolkit/application/application.py

@@ -956,7 +956,31 @@ def run_in_thread() -> None:
             set_exception_handler=set_exception_handler,
             handle_sigint=handle_sigint,
         )
-        if inputhook is None:
+
+        def _called_from_ipython() -> bool:
+            try:
+                return "IPython/terminal/interactiveshell.py" in sys._getframe(3).f_code.co_filename
+            except BaseException:
+                return False
+
+        if _called_from_ipython():
+            # workaround to make input hooks work for IPython until
+            # https://github.com/ipython/ipython/pull/14241 is merged.
+            # IPython was setting the input hook by installing an event loop
+            # previously.
+            try:
+                # See whether a loop was installed already. If so, use that.
+                # That's required for the input hooks to work, they are
+                # installed using `set_event_loop`.
+                loop = asyncio.get_event_loop()
+            except RuntimeError:
+                # No loop installed. Run like usual.
+                return asyncio.run(coro)
+            else:
+                # Use existing loop.
+                return loop.run_until_complete(coro)
+
+        elif inputhook is None:
             # No loop installed. Run like usual.
             return asyncio.run(coro)
         else: